Which gas is evolved in the following reaction?
2,4-dinitrophenol + $NaHC O_{3}$ $\to$ sodium 2,4-dinitrophenoxide + gas

Question

Which gas is evolved in the following reaction? 2,4-dinitrophenol + NaHC O 3 ​ → sodium 2,4-dinitrophenoxide + gas

TestHub · Accepted Answer

The two nitro groups (ortho and para) stabilise the phenoxide by resonance, making 2,4-dinitrophenol acidic enough ( p K a ​ ≈ 4.1) to react with bicarbonate; the carbonic acid formed decomposes, and the escape of C O 2 ​ gas pulls the equilibrium forward.

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